Portable electronic device

A portable electronic device, comprising:

• a housing that includes:
• a pair of main surface portions, wherein
• a first main surface portion of the pair of main surface portions includes a support portion that supports a display panel;
• a chassis member that includes a recessed portion;
• a first heat generating element;
• an antenna module in a vicinity of an inner surface of the housing, wherein a gap is present between the antenna module and the inner surface of the housing;
• a first heat diffusion member in the housing, wherein
• the first heat diffusion member is separated from the inner surface of the housing,
• the first heat diffusion member is thermally connected to the antenna module, and
• a path through which heat generated by the antenna module is transferred along the first heat diffusion member is separated from the inner surface of the housing;
• and
• a third heat diffusion member in the recessed portion of the chassis member, wherein
• the third heat diffusion member is in thermal contact with an inner surface of the recessed portion,
• the third heat diffusion member is separated from the inner surface of the housing, and
• heat generated by the first heat generating element is transferred to the third heat diffusion member via the support portion of the chassis member.